Lagerstroemia indica is robust and easy to cultivate, and has no strict requirements on soil, but it grows best when planted in deep and fertile sandy loam. Love the light, and should be planted in the lee or under the root of the south wall of the courtyard. If the light is insufficient, plants will not only spend less or not, but even grow weak and have small branches and leaves. Lagerstroemia indica is cold-resistant, but it should be well protected from cold and heat at seedling stage, and the adult plants over three years old do not need heat preservation. Lagerstroemia indica is drought-tolerant and afraid of waterlogging. Water it once a year before germination in spring and after defoliation in autumn. If it is not too dry at ordinary times, there is no need to water it. Drainage should be done well in rainy season to prevent water from rotting roots. Fertilization can be applied after defoliation in winter and before germination in spring every year, such as applying human manure or sesame paste residue, which can make plants grow vigorously and flowers big and colorful in the coming year. Generally, pruning should be carried out after defoliation in autumn, and long branches, dead branches, drooping branches, pests and diseases branches, slender branches and endogenous branches should be cut off in time during the young tree period, so that the upper part of the trunk can obtain sufficient nutrients and form a good crown.

Lagerstroemia indica is vulnerable to aphids, scale insects, spiny moths and leaf roller moths during the growth period. If it happens, dimethoate EC with 1000 times can be used to kill scale insects and aphids, and 80% dichlorvos EC with 1500 times can be used to kill spiny moths and leaf rollers.

The propagation of Lagerstroemia indica can be carried out by sowing, cutting and dividing plants, but the cutting method is the best, which not only has high survival rate, but also has fast plant formation, early flowering and high seedling rate. Cutting can be carried out in June. Select one-year-old robust branches with good lignification and no diseases and insect pests, cut and grow to about 15cm with sterile branches, cut off the lower leaves, leaving only two or three upper leaves, insert them into an intertillage sterile seedbed with a depth of about 10cm, and then cover them with plastic film and reed curtain for moisture and shade. Spray water 1 time every day after cutting, keep the humidity above 70%, and take root after 45 days. After the cuttings grow new buds, they are gradually illuminated, the plastic film is removed, and fertilization begins two months later. Cutting seedlings should be well protected from cold and heat when overwintering in seedbed, and can be transplanted and planted in April of the following year.

Breeding Management and Breeding Method of Lagerstroemia indica in Yin Wei has beautiful figure, smooth trunk, bright color and long flowering period. Summer and autumn are sustainable 100 days. It is a good ornamental, which can be used not only for beautifying courtyards, parks and green spaces, but also for potted viewing. Lagerstroemia indica likes sunshine, is slightly tolerant to shade, drought and waterlogging, and is strong in pruning. It grows well on calcareous soil and has strong cold resistance. Lagerstroemia indica can be propagated by sowing, cutting, layering, dividing plants, grafting and other methods.

1. A large number of healthy and tidy seedlings can be obtained by sowing and raising seedlings once. Collect1October165438+February 65438+February mature seeds, remove the peel, slightly dry the seeds, and put them in a container for drying and preservation. In March of the following year, the sandy loam seedbed was planted with wide banners or spread, covered with a layer of fine burnt marl and covered with grass, so that no seeds could be seen. Germinate for more than 10 days, uncover the grass in time, and sow after the rain when two pairs of true leaves appear; Weed frequently at seedling stage, topdressing thin fertilizer 2-3 times in June-July, and irrigating in summer to prevent drought. The height of seedlings at the end of the year is about 40-50 cm. Flowers can bloom in the year of vigorous growth, so they should be cut off in time and transplanted and grown up in the spring equinox the next year.

2. Cutting propagation can be hardwood cutting and softwood cutting.

Hardwood cutting is generally carried out in the middle and late March to early April before the branches germinate. Select stout annual branches, cut them into cuttings with a length of15cm, and insert them into a loose and well-drained sandy loam seedbed, and the cuttings are deep enough to expose the top buds of the cuttings. After insertion, it is filled with water and covered with plastic film to keep moisture and heat. When the seedlings grow to 15-20 cm, you can remove the film, put on the sunshade net and water them in time. The branches can grow to about 60-80 cm in that year.

Softwood cutting is carried out in July and August, when the new branches grow vigorously and have the most vitality. Select semi-lignified branches and cut them into cuttings of 8 ~ LOCM length, leaving 2 ~ 3 leaves at the top. The cutting depth is 3 ~ 4cm. After inserting, you can water it and shade it with a shade shed. Generally, it can take root in about 20 days. Remove the film, keep the sunshade net, and then water it in time. Branches can grow to about 60-80 cm in that year, and the survival rate is very good.

3. Meristem propagation In early March to April or autumn, the roots of tillering seedlings sprouting in the rhizosphere of plants are dug out, the roots and branches are appropriately pruned and planted separately. Small seedlings can be bare-rooted, and big seedlings should carry mud balls. During the tending period, they should be pruned and trimmed frequently to maintain a beautiful tree shape and promote the flourishing of flowers and branches.

4. layering propagation can be carried out all year round, especially in March-April in spring. In the air layering method, branches of 1 ~ 2 years old can be selected, cut and girdled with a sharp knife to expose xylem, and rooting powder solution can be applied about 3 cm above the cut part (diluted according to regulations). When it is dry, put a cylindrical plastic bag around the cut part, fill it with loose garden soil, water it and tie it tightly at both ends, and check it after one month. If the soil is too dry, it can be hydrated and moisturized.

5. There are several varieties of grafted Lagerstroemia indica, such as Yin Wei, and the flowers are white; Cuiwei, the flowers are blue-purple and lavender; Red, pink, crimson, etc. ; The author grafted several annual or biennial branches with different colors on the same tree, and the survival rate was over 98%. The specific method is: from late February to early March, before the branches of Lagerstroemia indica sprout. When grafting, the well-developed seedlings are selected as rootstocks, and the branches of the required color are used as scions, and the splitting method is adopted. First, the top of the rootstock near the peripheral part is split longitudinally with a knife about 5-8 cm deep, and then the scions of more than two buds with a length of 5-8 cm are cut into wedges and inserted into the split part of the rootstock to align with the cambium. Then wrap the whole spike with plastic film to expose the bud head. This method is used to graft branches of different colors on the same rootstock in layers to form multi-color trees. After 2-3 months of grafting, the membrane can be loosened. At this time, the length of the ear head can reach 50-80 cm. Branches should be cut short in time to avoid being broken by the wind and can be cultivated into thick branches. The survival rate of plants cultivated in this way is very good.